C++ ForEach Example

forEach.cpp

#include <iostream>
#include <string>
#include <functional>
#include <vector>

template<class ArrayType, class ValueType>
void forEach(const ArrayType& arr, std::function<void(const ValueType&)> callback) {
    for (auto entry : arr) {
        callback(entry);
    }
}

int main()
{
  std::vector<std::string> strArr;
  strArr.push_back("a");
  strArr.push_back("b");
  strArr.push_back("c");
  strArr.push_back("d");
  strArr.push_back("e");
  
  forEach<std::vector<std::string>, std::string>(strArr, [](const std::string& str) {
    std::cout << str << std::endl;
  });
}